# Relationship history for MSHA mine 1601318

Current hierarchy: **Maxwell L  Johnson III → AGGREGATE INDUSTRIES → JENKINS PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Trinity Industries Inc → JENKINS PIT; 1991-12-01 to 2018-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Companies Inc → JENKINS PIT; 1997-06-01 to 1997-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Bobby G  Johnson → JENKINS PIT; 1997-06-01 to 1997-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Bobby G  Johnson → Industrial Companies Inc; 1997-06-01 to 1997-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Materials Inc → JENKINS PIT; 1997-09-02 to 2012-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Trinity Industries Inc → Trinity Materials Inc; 1997-09-02 to 2012-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Maxwell L  Johnson III et al → JENKINS PIT; 2009-08-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AGGREGATE INDUSTRIES → JENKINS PIT; 2012-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maxwell L  Johnson III et al → AGGREGATE INDUSTRIES; 2012-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → JENKINS PIT; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Trinity Materials Inc; 2018-11-01 to 2012-07-31; source msha-controller-operator-history